Had to rush Tango to the Vet this morning. he's my little 4 pound chihuahua. His back right leg was giving him trouble last night, totally out of the blue. He and his chi sister Jazz are both x-penned during the day, so I can see no way he could have hurt himself whike I was gone.. And there have been no atypical activities during the week to account for him not being able to put weight on the leg. But all the gentle poking and moving and palpating of the area caused him no apparent pain, and he was eating and eliminating normally and it didn't appear to hurt him to squat, so I decided to wait 24 hours to see if it resolved. But this morning when I got up , he could no longer put weight on his left front leg either Again no obvious signs of pain, and normal behavior in other regards, but that was it for me. Put in a rush call in to my vet who said bring him in immediately. They wanted to keep him for the day to x-ray, run tests, observe etc. I'm quietly panicking, worried it's something neurological, or worse. So completely out of the blue!! He's almost 8, but he's always been very healthy. Not overweight, no hip or patella issues, no illnesses of any kind other than irritating allergy stuff. Please cross your fingers, pray, send good mojo, whatever your thing is, that this isn't as serious as I'm worried it's going to be.